Abaddon oversaw the training of the large army below the twisted spire of a tower his throne was located on. Visiting the reality Fear was located in and meeting his double had given him a few ideas, and one of them was this, forming an army from the denizens of Sheol to combat the pending invasion Kami was no doubt planning to unleash in Hope's reality.
There were "generals" in this army, handpicked by Abaddon and placed in control over divisions of the army. These generals, while free willed, were loyal to him by choice, knowing of his power and previous feats of subiugating their former rulers. 
As much as he would have liked to stay here to continue watching over everything, Abaddon knew he needed to return to Hope soon. If he was going to bring Sheol there, he needed to set things up properly. He had to be careful though. He knew that Kami's servants were seeking him, and that his double Apollyon would probably be sent to Hope quite soon to aid with this search. Standing up from his throne, he tore a rift back to Hope and jumped through.

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Abaddon's first matter of business was setting up the runes needed for allowing the demons to pour into Hope....